F-Droid - F-Droid is an interesting alternative for Android users who want to try something different and not have to use the Goole Play store all the time.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
APK Pure - Download apk for Android with APKPure APK downloader. NoAds, Faster apk downloads and apk file update speed. Best of all, it's free
Wondershare MobileGo - Wondershare MobileGo is a dependable and convenient application that can help you to reinforcement or exchange information from your Android mobile phone to the PC and access particular applications to deal with your records effortlessly.
APKMirror - Android Market and APK Downloads
Droid Explorer - A tool to manage your rooted Android device with the simplicity of Windows Explorer.